Salicylic Acid - and Methyl Jasmonate - Induced Protection on Photosynthesis to Paraquat Oxidative Stress
نویسندگان
چکیده
In the present work it is demonstrated that Salicylic acid (SA) and Methyl Jasmonate (MeJA) provided protection of photosynthesis (A) against paraquat (Pq) stress and diminished the oxidative damage caused by Pq. Barley seedlings (12d old) were supplied with 500 μM SA, 23 μM MeJA or 10 μM Pq via the transpiration stream and kept in the dark for 24 h. They were then exposed to 100 μmol.m–2.s–1 PAR and samples were taken 1, 2, 3, and 6 h after the light exposure. Leaf gas exchange parameters, the activity of RuBPC and of the photorespiratory enzymes PG, GO, and CAT were determined. Treatment of seedlings with SA or MeJA alone resulted in decreased levels of Chl, A and Tr. Pq treatment led to a decrease in Chl and protein content and to a very strong inhibition of A. Pq-treatment did not affect the activity of RuBPC but greatly increased the activity of the photorespiratory enzymes. Pre-treatment of seedlings with SA or MeJA fully blocked the inhibitory effect of Pq on A and provided protection against subsequent Pqinduced oxidative damage. This observation was confirmed by gas exchange parameters, Chl and protein content and by changes in lipid peroxidation, H2O2 level, and electrolyte leakage. The relationship between SA, MeJA and Pq toxicity and the degree of oxidative damage was examined by measuring the activities of several antioxidative enzymes such as SOD, APX, GR and POX. Treatment with 10 μM Pq reduced the activities of APX and GR. Pretreatment with 500 μM SA for 24 h in the dark greatly improved the capacity of the antioxidative defence system and increased Pq tolerance. Pre-treatment with 23 μM MeJA only partially improved the capacity of the antioxidative
منابع مشابه
تأثیر سالیسیلیک اسید و متیل جاسمونات بر شاخصههای رشد و عملکرد سوخ پیاز خوراکی، تحت شرایط تنش خشکی در مزرعه
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